[WP81] Serialization Weaver issue with Assembly-CSharp.dll

I was isolating a runtime data serialization error in a new smaller project while I ran on an issue of the Serialization Weaver.

 Error building Player: UnityException: Failed to run serialization weaver with command "Temp\StagingArea\Data\Managed\Assembly-CSharp.dll" -pdb -verbose -unity-engine=Temp\StagingArea\Data\Managed\UnityEngine.dll "Temp\StagingArea\TempSerializationWeaver".
 Symbols will be read from Temp\StagingArea\Data\Managed\UnityEngine.pdb
 Weaving assembly C:\dev\UnityProjects\TestProject\TestProject\Temp\StagingArea\Data\Managed\Assembly-CSharp.dll
 Symbols will be read from Temp\StagingArea\Data\Managed\Assembly-CSharp.pdb
 Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'ExternalLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
    � Mono.Cecil.BaseAssemblyResolver.Resolve(AssemblyNameReference name, ReaderParameters parameters)
    � Mono.Cecil.DefaultAssemblyResolver.Resolve(AssemblyNameReference name)
    � Mono.Cecil.MetadataResolver.Resolve(TypeReference type)
    � Unity.CecilTools.Extensions.ResolutionExtensions.Resolve[TReference,TDefinition](TReference reference, Func`2 resolve)
    � Unity.CecilTools.Extensions.TypeDefinitionExtensions.IsSubclassOf(TypeDefinition type, String baseTypeName)
    � Unity.Serialization.Weaver.MethodEmitterBase.WillUnitySerialize(FieldDefinition fieldDefinition)
    � Unity.Serialization.Weaver.SerializeMethodEmitter.ShouldProcess(FieldDefinition fieldDefinition)
    � System.Linq.Enumerable.<>c__DisplayClassf`1.<CombinePredicates>b__e(TSource x)
    � System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
    � Unity.Serialization.Weaver.MethodEmitterBase.EmitMethodBody()
    � Unity.Serialization.Weaver.SerializationWeaver.AddSerializeMethod()
    � Unity.Serialization.Weaver.SerializationWeaver.Weave()
    � usw.Weaver.WeaveAssembly(String assemblyPath, AssemblyDefinition unityEngineAssemblyDefinition)
    � usw.Weaver.Weave()
    � usw.Program.RunProgram(ConversionOptions options)
    � usw.Program.Main(String[] args)
 

1. Importing both WP81 and standalone windows DLLs of my class library was successful

2. It's only when building to Windows Store/Phone8.1 SDK that the error occurs.

My class library contains one class MyGenericClass:

 using System;
 
 namespace ExternalLib
 {
     [Serializable]
     public abstract class MyGenericClass<T>
     {
         public T m_Value;
     }
 }
 

My project class using the generic one looks like:

 using System;
 using ExternalLib;
 
 [Serializable]
 public class MyClass : MyGenericClass<int>
 {
     public int GetValue()
     {
         return m_Value;
     }
 }
 

Removing inheritance of MyGenericClass from MyClass prevents this issue from happening, but I still want to make it work... I was also suspecting Generic type classes could have anything to do with this but still, I'm already using this kind of generic classes and I know it's working.

What am I not doing correctly?

[1]: /storage/temp/49209-testproject.zip

[2]: /storage/temp/49211-plugins-importsettings.png